Did it need all 20 seconds? If so, the docs were definitely wrong and useless and I see your point. My suspicion is that it works fine with 5 actual clock seco

Did it need all 20 seconds? If so, the docs were definitely wrong and useless and I see your point. My suspicion is that it works fine with 5 actual clock seconds (instead of "a short while"), and that they just said 20 so that even the most chronologically challenged would end up holding it for at least 5.